( ^ ) The caret symbol is the control key.
( ⇧ ) The single arrow up is the shift key.
( ⇪ ) The arrow up with the line under it is the caps lock key.
( ⌘ ) Most people don’t miss the command key since the symbol is on the keyboard.
( ⌥ ) The upper right to lower left slash with the line above it is the alt/option key. One hint to remembering this key is the symbol has two parts and the print on the keyboard has two words.